STAS 1733-1989 Non mctallic gaskets GASKETS FOR PRESSURE-TIGIIT FLAT SURFACES NP2 5 NP6 XP10 NP10 NP25 NP40 Dimenbions《非金属垫圈 密闭平面NP2.5、NP6、XP10、NP10、NP25、NP40垫圈 尺寸》.pdf

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